Recently, Dufour et al. (2007) reported the unexpected discovery that a few white dwarfs found in the Sloan Digital Sky Survey had an atmosphere dominated by carbon with little or no trace of hydrogen and helium. Here we present a progress report on these new objects based on new high signal-to-noise follow-up spectroscopic observations obtained at the 6.5m MMT telescope on Mount Hopkins, Arizona.
Journal of Physics Conference Series
- Pub Date:
- June 2009
- Astrophysics - Solar and Stellar Astrophysics
- 6 pages, 2 figures, to appear in Journal of Physics Conference Proceedings for the 16th European White Dwarf Workshop